000Book_G18DBL_ChS.indb

Transcription

1 Cordless Disc Grinder G 18DBL English Keep for future reference Handling instructions

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22 English CONTENTS GENERAL POWER TOOL SAFETY WARNINGS...22 SAFETY WARNINGS COMMON FOR GRINDING OR ABRASIVE CUTTING-OFF OPERATIONS...25 KICKBACK AND RELATED WARNINGS...26 SAFETY WARNINGS SPECIFIC FOR GRINDING AND ABRASIVE CUTTING-OFF OPERATIONS...27 ADDITIONAL SAFETY WARNINGS SPECIFIC FOR ABRASIVE CUTTING-OFF OPERATIONS...28 GENERAL SAFETY INSTRUCTIONS FOR CORDLESS DISC GRINDERS...28 ADDITIONAL SAFETY WARNINGS...29 CAUTION ON LITHIUM-ION BATTERY...30 SYMBOL...31 STANDARD ACCESSORIES...32 APPLICATIONS...32 SPECIFICATIONS...33 BATTERY REMOVAL/INSTALLATION...33 CHARGING...34 PRIOR TO OPERATION...36 GRINDER OPERATION...38 DEPRESSED CENTER WHEEL ASSEMBLY AND DISASSEMBLY...39 MAINTENANCE AND INSPECTION...40 SELECTING ACCESSORIES...42 GENERAL POWER TOOL SAFETY WARNINGS WARNING Read all safety warnings and all instructions. Failure to follow the warnings and instructions may result in electric shock, fi re and/or serious injury. Save all warnings and instructions for future reference. The term power tool in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool. 1) Work area safety a) Keep work area clean and well lit. Cluttered or dark areas invite accidents. b) Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes. 22

23 English c) Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control. 2) Electrical safety a) Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodifi ed plugs and matching outlets will reduce risk of electric shock. b) Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded. c) Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock. d) Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock. e) When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock. f) If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) protected supply. Use of an RCD reduces the risk of electric shock. 3) Personal safety a) Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating power tools may result in serious personal injury. b) Use personal protective equipment. Always wear eye protection. Protective equipment such as dust mask, non-skid safety shoes, hard hat, or hearing protection used for appropriate conditions will reduce personal injuries. c) Prevent unintentional starting. Ensure the switch is in the off position before connecting to power source and/or battery pack, picking up or carrying the tool. Carrying power tools with your fi nger on the switch or energising power tools that have the switch on invites accidents. d) Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a rotating part of the power tool may result in personal injury. e) Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations. f) Dress properly. Do not wear loose clothing or jewellery. Keep your hair, clothing and gloves away from moving parts. Loose clothes, jewellery or long hair can be caught in moving parts. 23

24 English g) If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. Use of dust collection can reduce dust-related hazards. 4) Power tool use and care a) Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed. b) Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired. c) Disconnect the plug from the power source and/or the battery pack from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally. d) Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users. e) Maintain power tools. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the power toolʼs operation. If damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools. f) Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control. g) Use the power tool, accessories and tool bits etc. in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different from those intended could result in a hazardous situation. 5) Battery tool use and care a) Recharge only with the charger specified by the manufacturer. A charger that is suitable for one type of battery pack may create a risk of fi re when used with another battery pack. b) Use power tools only with specifically designated battery packs. Use of any other battery packs may create a risk of injury and fi re. c) When battery pack is not in use, keep it away from other metal objects, like paper clips, coins, keys, nails, screws or other small metal objects, that can make a connection from one terminal to another. Shorting the battery terminals together may cause burns or a fi re. d) Under abusive conditions, liquid may be ejected from the battery; avoid contact. If contact accidentally occurs, flush with water. If liquid contacts eyes, additionally seek medical help. 24

25 25 English Liquid ejected from the battery may cause irritation or burns. 6) Service a) Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained. CAUTION Keep children and infirm persons away. When not in use, tools should be stored out of reach of children and infirm persons. SAFETY WARNINGS COMMON FOR GRINDING OR ABRASIVE CUTTING-OFF OPERATIONS a) This power tool is intended to function as a grinder or cut-off tool. Read all safety warnings, instructions, illustrations and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fi re and/or serious injury. b) Operations such as sanding, wire brushing or polishing are not recommended to be performed with this power tool. Operations for which the power tool was not designed may create a hazard and cause personal injury. c) Do not use accessories which are not specifically designed and recommended by the tool manufacturer. Just because the accessory can be attached to your power tool, it does not assure safe operation. d) The rated speed of the accessory must be at least equal to the maximum speed marked on the power tool. Accessories running faster than their rated speed can break and fl y apart. e) The outside diameter and the thickness of your accessory must be within the capacity rating of your power tool. Incorrectly sized accessories cannot be adequately guarded or controlled. f) Threaded mounting of accessories must match the grinder spindle thread. For accessories mounted by flanges, the arbour hole of accessory must fit the locating diameter of the flange. Accessories that do not match the mounting hardware of the power tool will run out of balance, vibrate excessively and may cause loss of control. g) Do not use a damaged accessory. Before each use inspect the accessory such as abrasive wheels for chips and cracks, backing pad for cracks, tear or excess wear, wire brush for loose or cracked wires. If power tool or accessory is dropped, inspect for damage or install an undamaged accessory. After inspecting and installing an accessory, position yourself and bystanders away from the plane of the rotating accessory and run the power tool at maximum no-load speed for one minute. Damaged accessories will normally break apart during this test time.

26 English h) Wear personal protective equipment. Depending on application, use face shield, safety goggles or safety glasses. As appropriate, wear dust mask, hearing protectors, gloves and workshop apron capable of stopping small abrasive or workpiece fragments. The eye protection must be capable of stopping fl ying debris generated by various operations. The dust mask or respirator must be capable of fi ltrating particles generated by your operation. Prolonged exposure to high intensity noise may cause hearing loss. i) Keep bystanders a safe distance away from work area. Anyone entering the work area must wear personal protective equipment. Fragments of workpiece or of a broken accessory may fl y away and cause injury beyond immediate area of operation. j) Hold the power tool by insulated gripping surfaces only, when performing an operation where the cutting tool may contact hidden wiring. Contact with a live wire will also make exposed metal parts of the power tool live and could give the operator an electric shock. k) Position the cord clear of the spinning accessory. If you lose control, the cord may be cut or snagged and your hand or arm may be pulled into the spinning accessory. l) Never lay the power tool down until the accessory has come to a complete stop. The spinning accessory may grab the surface and pull the power tool out of your control. m) Do not run the power tool while carrying it at your side. Accidental contact with the spinning accessory could snag your clothing, pulling the accessory into your body. n) Regularly clean the power tool s air vents. The motor s fan will draw the dust inside the housing and excessive accumulation of powdered metal may cause electrical hazards. o) Do not operate the power tool near flammable materials. Sparks could ignite these materials. p) Do not use accessories that require liquid coolants. Using water or other liquid coolants may result in electrocution or shock. KICKBACK AND RELATED WARNINGS Kickback is a sudden reaction to a pinched or snagged rotating wheel, backing pad, brush or any other accessory. Pinching or snagging causes rapid stalling of the rotating accessory which in turn causes the uncontrolled power tool to be forced in the direction opposite of the accessory s rotation at the point of the binding. For example, if an abrasive wheel is snagged or pinched by the workpiece, the edge of the wheel that is entering into the pinch point can dig into the surface of the material causing the wheel to climb out or kick out. The wheel may either jump toward or away from the operator, depending on direction of the wheel s movement at the point of pinching. Abrasive wheels may also break under these conditions. Kickback is the result of power tool misuse and/or incorrect operating procedures or conditions and can be avoided by taking proper precautions as given below. 26

27 English a) Maintain a firm grip on the power tool and position your body and arm to allow you to resist kickback forces. Always use auxiliary handle, if provided, for maximum control over kickback or torque reaction during start-up. The operator can control torque reactions or kickback forces, if proper precautions are taken. b) Never place your hand near the rotating accessory. Accessory may kickback over your hand. c) Do not position your body in the area where power tool will move if kickback occurs. Kickback will propel the tool in direction opposite to the wheel s movement at the point of snagging. d) Use special care when working corners, sharp edges etc. Avoid bouncing and snagging the accessory. Corners, sharp edges or bouncing have a tendency to snag the rotating accessory and cause loss of control or kickback. e) Do not attach a saw chain woodcarving blade or toothed saw blade. Such blades create frequent kickback and loss of control. SAFETY WARNINGS SPECIFIC FOR GRINDING AND ABRASIVE CUTTING-OFF OPERATIONS a) Use only wheel types that are recommended for your power tool and the specific guard designed for the selected wheel. Wheels for which the power tool was not designed cannot be adequately guarded and are unsafe. b) The grinding surface of centre depressed wheels must be mounted below the plane of the guard lip. An improperly mounted wheel that projects through the plane of the guard lip cannot be adequately protected. c) The guard must be securely attached to the power tool and positioned for maximum safety, so the least amount of wheel is exposed towards the operator. The guard helps to protect the operator from broken wheel fragments, accidental contact with wheel and sparks that could ignite clothing. d) Wheels must be used only for recommended applications. For example: do not grind with the side of cut-off wheel. Abrasive cut-off wheels are intended for peripheral grinding, side forces applied to these wheels may cause them to shatter. e) Always use undamaged wheel flanges that are of correct size and shape for your selected wheel. Proper wheel fl anges support the wheel thus reducing the possibility of wheel breakage. Flanges for cut-off wheels may be different from grinding wheel fl anges. f) Do not use worn down wheels from larger power tools. Wheel intended for larger power tool is not suitable for the higher speed of a smaller tool and may burst. 27

28 English ADDITIONAL SAFETY WARNINGS SPECIFIC FOR ABRASIVE CUTTING-OFF OPERATIONS a) Do not jam the cut-off wheel or apply excessive pressure. Do not attempt to make an excessive depth of cut. Overstressing the wheel increases the loading and susceptibility to twisting or blinding of the wheel in the cut and the possibility of kickback or wheel breakage. b) Do not position your body in line with and behind the rotating wheel. When the wheel, at the point of operation, is moving away from your body, the possible kickback may propel the spinning wheel and the power tool directly at you. c) When wheel is binding or when interrupting a cut for any reason, switch off the power tool and hold the power tool motionless until the wheel comes to a complete stop. Never attempt to remove the cut-off wheel from the cut while the wheel is in motion otherwise kickback may occur. Investigate and take corrective action to eliminate the cause of wheel binding. d) Do not restart the cutting operation in the workpiece. Let the wheel reach full speed and carefully re-enter the cut. The wheel may bind, walk up or kickback if the power tool is restarted in the workpiece. e) Support panels or any oversized workpiece to minimize the risk of wheel pinching and kickback. Large workpieces tend to sag under their own weight. Supports must be placed under the workpiece near the line of cut and near the edge of the workpiece on both sides of the wheel. f) Use extra caution when making a pocket cut into existing walls or other blind areas. The protruding wheel may cut gas or water pipes, electrical wiring or objects that can cause kickback. GENERAL SAFETY INSTRUCTIONS FOR CORDLESS DISC GRINDERS Check that speed marked on the wheel is equal to or greater than the rated speed of the grinder; Ensure that the wheel dimensions are compatible with the grinder; Abrasive wheels shall be stored and handled with care in accordance with manufacturer s instructions; Inspect the grinding wheel before use, do not use chipped, cracked or otherwise defective products; Ensure that mounted wheels and points are fitted in accordance with the manufacturer s instructions; Ensure that blotters are used when they are provided with the bonded abrasive product and when they are required; 28

29 29 English Ensure that the abrasive product is correctly mounted Side guard and tightened before use and run the tool at no-load for 30 seconds in a safe position, stop immediately if there is considerable vibration or if other defects are detected. If this condition occurs, check the machine to determine the cause; Fig. 1 If a guard is equipped with the tool never use the tool without such a guard; When using a abrasive cutting wheel, be sure to remove the standard accessory wheel guard and attach the wheel guard with side guard (sold separately) (Fig. 1); Do not use separate reducing bushings or adapters to adapt large hole abrasive wheels; For tools intended to be fitted with threaded hole wheel, ensure that the thread in the wheel is long enough to accept the spindle length; Check that the work piece is properly supported; Do not use cutting off wheel for side grinding; Ensure that sparks resulting from use do not create a hazard e.g. do not hit persons, or ignite flammable substances; Ensure that ventilation openings are kept clear when working in dusty conditions, if it should become necessary to clear dust, first disconnect the tool from the mains supply (use non metallic objects) and avoid damaging internal parts; Always use eye and ear protection. Other personal protective equipment such as dust mask, gloves, helmet and apron should be worn; Pay attention to the wheel that continues to rotate after the tool is switched off. Do not allow foreign matter to enter the hole for connecting the rechargeable battery. Never disassemble the rechargeable battery and charger. Never short-circuit the rechargeable battery. Short-circuiting the battery will cause a great electric current and overheat. It results in burn or damage to the battery. Do not dispose of the battery in fire. If the battery burnt, it may explode. Do not insert object into the air ventilation slots of the charger. Inserting metal objects or inflammables into the charger air ventilation slots will result in electrical shock hazard or damaged charger. Bring the battery to the shop from which it was purchased as soon as the postcharging battery life becomes too short for practical use. Do not dispose of the exhausted battery. ADDITIONAL SAFETY WARNINGS 1 Ensure that the depressed center wheel to be utilized is the correct type and free of cracks or surface defects. Also ensure that the depressed center wheel is properly mounted and the wheel nut is securely tightened. 2. Confirm that the push button is disengaged by pushing push button two or three times before switching the power tool on.

30 English 3. To prolong the life of the machine and ensure a first class finish, it is important that the machine should not be overloaded by applying too much pressure. In most applications, the weight of the machine alone is sufficient for effective grinding. Too much pressure will result in reduced rotational speed, inferior surface finish, and overloading which could reduce the life of the machine. 4. The wheel continues to rotate after the tool is switched off. After switching off the machine, do not put it down until the depressed center wheel has come to a complete stop. Apart from avoiding serious accidents, this precaution will reduce the amount of dust and swarf sucked into the machine. 5. When the machine is not use, the power source should be disconnected. 6. Be sure to switch OFF and disconnect the attachment plug from the receptacle to avoid a serious accident before the depressed center wheel is assembling and disassembling. CAUTION ON LITHIUM-ION BATTERY To extend the lifetime, the lithium-ion battery equips with the protection function to stop the output. In the cases of 1 to 3 described below, when using this product, even if you are pulling the switch, the motor may stop. This is not the trouble but the result of protection function. 1. When the battery power remaining runs out, the motor stops. In such case, charge it up immediately. 2. If the tool is overloaded, the motor may stop. In this case, release the switch of tool and eliminate causes of overloading. After that, you can use it again. 3. If the battery is overheated under overload work, the battery power may stop. In this case, stop using the battery and let the battery cool. After that, you can use it again. Furthermore, please heed the following warning and caution. WARNING In order to prevent any battery leakage, heat generation, smoke emission, explosion and ignition beforehand, please be sure to heed the following precautions. 1. Make sure that swarf and dust do not collect on the battery. During work make sure that swarf and dust do not fall on the battery. Make sure that any swarf and dust falling on the power tool during work do not collect on the battery. Do not store an unused battery in a location exposed to swarf and dust. Before storing a battery, remove any swarf and dust that may adhere to it and do not store it together with metal parts (screws, nails, etc.). 2. Do not pierce battery with a sharp object such as a nail, strike with a hammer, step on, throw or subject the battery to severe physical shock. 3. Do not use an apparently damaged or deformed battery. 4. Do not use the battery in reverse polarity. 5. Do not connect directly to an electrical outlets or car cigarette lighter sockets. 30

31 English 6. Do not use the battery for a purpose other than those specified. 7. If the battery charging fails to complete even when a specified recharging time has elapsed, immediately stop further recharging. 8. Do not put or subject the battery to high temperatures or high pressure such as into a microwave oven, dryer, or high pressure container. 9. Keep away from fire immediately when leakage or foul odor are detected. 10. Do not use in a location where strong static electricity generates. 11. If there is battery leakage, foul odor, heat generated, discolored or deformed, or in any way appears abnormal during use, recharging or storage, immediately remove it from the equipment or battery charger, and stop use. CAUTION 1. If liquid leaking from the battery gets into your eyes, do not rub your eyes and wash them well with fresh clean water such as tap water and contact a doctor immediately. If left untreated, the liquid may cause eye-problems. 2. If liquid leaks onto your skin or clothes, wash well with clean water such as tap water immediately. There is a possibility that this can cause skin irritation. 3. If you find rust, foul odor, overheating, discolor, deformation, and/or other irregularities when using the battery for the first time, do not use and return it to your supplier or vendor. WARNING If an electrically conductive foreign object enters the terminals of the lithium ion battery, a short-circuit may occur resulting in the risk of fire. Please observe the following matters when storing the battery. Do not place electrically conductive cuttings, nails, steel wire, copper wire or other wire in the storage case. Either install the battery in the power tool or store by securely pressing into the battery cover until the ventilation holes are concealed to prevent short-circuits (See Fig. 2). SYMBOL WARNING The following show symbols used for the machine. Be sure that you understand their meaning before use. Read all safety warnings and all instructions. Ventilation holes Terminals Battery cover Battery Fig. 2 31

32 English STANDARD ACCESSORIES G18DBL has two types which are designated as 2LJRK and NN. For their respective accessories, see the Table below. Table 1 G18DBL (2LJRK) (NN) Depressed center wheel 1 1 Wrench 1 1 Side handle 1 1 Charger (UC18YFSL) 1 Battery (BSL1850) 2 Battery cover 1 Plastic case 1 APPLICATIONS Removal of casting fi n and fi nishing of various types of steel, bronze and aluminum materials and castings. Grinding of welded sections or sections cut by means of a cutting torch. Grinding of synthetic resins, slate, brick, marble, etc. Cutting of synthetic concrete, stone, brick, marble, and similar materials. 32

33 SPECIFICATIONS POWER TOOL Model Voltage Rated Speed Outer dia. thickness hole dia. Wheel peripheral speed Rechargeable battery Weight CHARGER Model Charging voltage Weight G18DBL 18 V 9000 /min AUTO Mode: 5500 /min mm 80 m/s BSL1850: Li-ion 18 V (5.0 Ah 10 cells) 2.3 kg UC18YFSL 14.4 V 18 V 0.5 kg English BATTERY REMOVAL/INSTALLATION 1. Battery removal Hold the handle tightly and push the battery latches to remove the battery (see Fig. 3, 4). CAUTION Never short-circuit the battery. 2. Battery installation Insert the battery while observing its polarities (see Fig. 4). Latch Ventilation holes Terminals Battery cover Battery Latch Fig. 3 Battery Push Pull out Insert Fig. 4 33

34 English CHARGING Before using the power tool, charge the battery as follows. 1. Connect the charger s power cord to the receptacle. When connecting the plug of the charger to a receptacle, the pilot lamp will blink in red (At 1- second intervals). 2. Insert the battery into the charger. Firmly insert the battery into the charger as shown in Fig Charging When inserting a battery in the charger, charging will commence and the pilot lamp will light continuously in red. When the battery becomes fully recharged, the pilot lamp will blink in red. (At 1-second intervals) (See Table 2) Pilot lamp indication The indications of the pilot lamp will be as shown in Table 2, according to the condition of the charger or the rechargeable battery. Table 2 Indications of the pilot lamp Before charging Blinks Lights for 0.5 seconds. Does not light for 0.5 seconds. (off for 0.5 seconds) Pilot lamp Charger Fig. 5 Battery While charging Lights Lights continuously Pilot lamp (red) Charging complete Overheat standby Charging impossible Blinks Blinks Flickers Lights for 0.5 seconds. Does not light for 0.5 seconds. (off for 0.5 seconds) Lights for 1 second. Does not light for 0.5 seconds. (off for 0.5 seconds) Lights for 0.1 seconds. Does not light for 0.1 seconds. (off for 0.1 seconds) Battery overheated. Unable to charge. (Charging will commence when battery cools) Malfunction in the battery or the charger 34

35 Regarding the temperatures and charging time of the battery. The temperatures and charging time will become as shown in Table 3. Table 3 Battery Charger UC18YFSL Charging voltage V Weight kg 0.5 Temperatures at which the battery can be recharged 0oC 50oC Charging time for battery capacity, approx. (At 20oC) 1.5 Ah min. 2.0 Ah min. 2.5 Ah min. 3.0 Ah min. 4.0 Ah min. 5.0 Ah min Number of battery cells 4 10 English NOTE The recharging time may vary according to temperature and power source voltage. CAUTION When the battery charger has been continuously used, the battery charger will be heated, thus constituting the cause of the failures. Once the charging has been completed, give 15 minutes rest until the next charging. 4. Disconnect the charger s power cord from the receptacle. 5. Hold the charger fi rmly and pull out the battery. NOTE Be sure to pull out the battery from the charger after use, and then keep it. CAUTION If the battery is charged while it is heated because it has been left for a long time in a location subject to direct sunlight or because the battery has just been used, the pilot lamp of the charger lights for 1 second, does not light for 0.5 seconds (off for 0.5 seconds). In such a case, first let the battery cool, then start charging. When the pilot lamp flickers (at 0.2-second intervals), check for and take out any foreign objects in the charger s battery connector. If there are no foreign objects, it is probable that the battery or charger is malfunctioning. Take it to your authorized Service Center. 35

36 English Since the built-in micro computer takes about 3 seconds to confirm that the battery being charged with charger is taken out, wait for a minimum of 3 seconds before reinserting it to continue charging. If the battery is reinserted within 3 seconds, the battery may not be properly charged. If the pilot lamp does not blink in red (every second) even though the charger cord is connected to the power, it indicates that the protection circuit of the charger may be activated. Remove the cord or plug from the power and then connect it again after 30 seconds or so. If this does not cause the pilot lamp to blink in red (every second), please take the charger to the Hitachi Authorized Service Center. PRIOR TO OPERATION 1. Power switch Ensure that the switch is in the OFF position. 2. Check your work environment Ensure the following before operation: No fl ammable gas, liquid, or object at worksite. When grinding thin steel sheet it may cause a high booming noise. To avoid such noise, place a rubber mat under the workpiece. Clear the area of children or unauthorized personnel. 3. Mounting the wheel guard (Fig. 6) Be sure to mount the wheel guard at an angle that will protect the operator s body from injury by a broken Screw wheel piece. [Installing Wheel Guard] Slightly loosen the screw on the wheel guard. Install the wheel guard to the packing gland, turn it to the angle suitable for operation, and make adjustment. After the adjustment, ensure that the screw is securely tightened on the wheel guard in order to fi x it completely. 4. Thoroughly check that the depressed center wheel is free of cracks, splits and other abnomalities before mounting. Make sure it is fi rmly clamped and has been properly mounted. Refer to page 39 of this manual for Depressed Center Wheel Assembly and Disassembly. 5. Test the grinder before using. Fig. 6 Wheel guard Packing gland Before actually beginning the grinding work, test the grinder by fi rst clearing the area of all other personnel. Make sure the wheel guard is in place and that you are wearing eye protection. Turn the grinder on, and make sure the grinder runs smoothly and shows no abnormalities. Duration of the trial run is as follows: When depressed center wheel is replaced...3 minutes or more When starting daily work...1 minute or more 36

37 6. Use only properly rated depressed center wheels. Use only depressed center wheels rated at 13,300 RPM or more. Using a depressed center wheel rated less can lead to wheel disintegration during operation and cause serious bodily injury. 7. Check the push button. Make sure that the push button is disengaged by pushing push button two or three times before turning on the grinder. (Fig. 7) 8. About Remaining Battery Indicator When pressing the remaining battery indicator switch, the remaining battery indicator lamp lights and the battery remaining power can be checked. (Fig. 8) When releasing your fi nger from the remaining battery indicator switch, the remaining battery indicator lamp goes off. The Table 4 shows the state of remaining battery indicator lamp and the battery remaining power. State of lamp Fig. 8 Table 4 Battery Remaining Power The battery remaining power is enough. Push button Remaining battery indicator switch Fig. 7 English Remaining battery indicator lamp The battery remaining power is a half. The battery remaining power is nearly empty. Re-charge the battery soonest possible. As the remaining battery indicator shows somewhat differently depending on ambient temperature and battery characteristics, read it as a reference. NOTE Do not give a strong shock to the switch panel or break it. It may lead to a trouble. To save the battery power consumption, the remaining battery indicator lamp lights while pressing the remaining battery indicator switch. 37

38 English 9. About the Mode Change Function (Fig. 9) With the battery installed to the main unit and the unit switched on, pressing the Mode Change switch will switch the operation mode to auto mode. While in Auto Mode, the Auto Mode display lamp will remain lit. With Auto Mode, you can lower noise and vibration by lowering the maximum number of revolutions while in a no-load state. While in Auto Mode, the number of revolutions will be raised if the load becomes greater during operation. On the other hand, the number of revolutions will be lowered if the load decreases during operation. GRINDER OPERATION Mode change switch Fig. 9 CAUTION To extend the lifetime, the lithium-ion battery equips with the protection function to stop the output. Therefore, if the tool is overloaded, the motor may stop. However, this is not the trouble but the result of protection function. In this case, release the switch of tool and eliminate the causes of overloading. NOTE To prevent injuries, this product has a function that prevents unexpected motor rotation when the battery is inserted. The motor will not run if the battery is inserted while the switch is still ON. After installing the battery, turn the switch off and then back on again. The G18DBL model is equipped with a protection function that will shut down the tool in the event of an overload. Should the tool shut down due to an overload, turn the power off and then turn it back on again. An overload that stops tool operation and lasts more than 10 seconds may not be released by turning the power off and on. Should this happen, remove the battery from the tool and reinstall it before turning on the power switch. 1. Hold the grinder fi rmly by its housing and side handle (Fig. 10). The grinder produces a counterforce which must be controlled by fi rmly holding onto the grinder. 2. Turn the grinder on. (Fig. 11) While holding the grinder fi rmly, use one fi nger to slide the switch to the on position. 3. Use light grinding pressure. There is no need to press hard when grinding. Usually the grinder s own weight is sufficient to allow the required light contact with the surface to be ground. 38 Fig. 10 ON Side handle OFF Switch Fig. 11

39 English WARNING Do not press the grinder forcibly against the surface to be ground. Heavy pressure can result in wheel breakage and serious injury. It can also damage the surface being ground or damage the grinder s motor. 4. Use proper grinding angle. Grind only with the wheel s edge by lifting the grinder 15 to 30, as shown in Fig. 12. CAUTION Do not use the entire surface of the depressed center wheel. Use only the edge of the depressed center wheel. A B 5. Move the grinder in the proper direction. Fig. 12 When using a new depressed center wheel in direction A (Fig. 12), the wheel edge may cut into the workpiece. In this case, grind in direction B (Fig. 12). Once the wheel edge is worn, the workpiece can be ground in both directions. NOTE The wheel provided (resinoid wheel) is rated as Class A grain and # 36 grain size. It is most suitable for heavy grinding of steel and other types of materials. 6. Adjust operation to desired fi nish. For a fi ne fi nish, decrease pressure by lifting slightly. Grind slowly and at the appropriate speed. CAUTION The revolving depressed center wheel will create air turbulence. Do no lay the grinder down in areas of dust or dirt until it has come to a complete stop. DEPRESSED CENTER WHEEL ASSEMBLY AND DISASSEMBLY WARNING Be sure to turn off the switch and pull out the battery. 1. Assembling (1) Turn the disc grinder upsidedown so that the spindle is facing upward. (2) Align the across fl ats of the wheel washer with the notched part of the spindle, then attach them. (3) Fit the protuberance of the depressed center wheel onto the wheel washer. (4) Screw the wheel nut onto the spindle. (5) While pushing the push button with one hand, lock the spindle by turning the depressed center wheel slowly with the other hand. Tighten the wheel nut by using the supplied wrench as shown in Fig. 13 on page

40 English Wrench Tighten Tighten Wheel nut Depressed center wheel Diamond wheel Wheel nut Cutting wheel Wheel washer Spindle Wheel washer Wheel guard Push button Fig. 13 Wheel guard Push button Spindle CAUTION Tighten the wheel nut securely and confirm that the depressed center wheel does not wobble. 2. Disassembly To remove the depressed center wheel, simply reverse the above-mentioned procedure. Attach or detach the diamond wheel or cutting wheel in the same manner as the depressed center wheel. MAINTENANCE AND INSPECTION WARNING Be sure to turned off the switch and pull out the battery. Using cracked, deformed or damaged wheels can lead to wheel breakage and resulting serious injury. 1. Replacing the depressed center wheel Replacing the depressed center wheel when it has been worn out to about 60 mm in external diameter. Confi rm that there is no crack or any damage to the depressed center wheel. If there is a crack or a transformation in the wheel, replace it immediately. 2. Check the Screws Loose screws are dangerous. Regularly inspect them and make sure they are tight. CAUTION Using this power tool with loosened screws is extremely dangerous. 40

41 English 3. Maintenance of the motor The motor unit winding is the very heart of the power tool. Exercise due care to ensure the winding does not become damaged and/or wet with oil or water. 4. Check for Dust Dust may be removed with a soft cloth or a cloth dampened with soapy water. Do not use bleach, chlorine, gasoline or thinner, for they may damage the plastics. 5. Cleaning the fi lter After use, detach the fi lter and remove any grime or dust from the screen with an airgun or other tool. (Fig. 14) NOTE To clear the unit of grime or dust, periodically run the motor in a no-load state and blow Filter dry air into the ventilation hole with the fi lter Fig. 14 removed. Accumulation of grime or dust accumulates in the motor can cause damage. After cleaning, make sure to securely attach the fi lter. 6. Storage Store the cordless disc grinder in a place in which the temperature is less than 40 C, and out of reach of children. NOTE Make sure the batteries have been fully charged before storing them. Prolonged storage (3 months or more) of batteries with a low charge may result in performance deterioration, signifi cantly reducing battery usage time or rendering the batteries incapable of holding a charge. However, signifi cantly reduced battery usage time may be recovered by repeatedly charging and using the batteries two to fi ve times. If the battery usage time is extremely short despite repeated charging and use, consider the batteries dead and purchase new batteries. CAUTION In the operation and maintenance of power tools, the safety regulations and standards prescribed in each country must be observed. Important notice on the batteries for the Hitachi cordless power tools Please always use one of our designated genuine batteries. We cannot guarantee the safety and performance of our cordless power tool when used with batteries other than these designated by us, or when the battery is disassembled and modifi ed (such as disassembly and replacement of cells or other internal parts). 41

42 English SELECTING ACCESSORIES Select accessories that are suited to a specifi c task. For details contact Hitachi Authorized Service Center. Part Number: Wheel guard Part Number: Z Wrench Part Number: Side handle Part Number: Z Wheel washer Part Number: (A36Q) Depressde center wheel Part Number: Wheel guard (for cutting wheel) Part Number: Wheel nut 18V (Li-ion) Battery UC18YFSL (14.4V 18V) Charger Part Number: Case Part Number: Battery cover 42

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